In a normal approximation to the Wilcoxon rank sum test, the standardized test statistic is calculated as z = 1.80. For a two-tail test, the p-value is:
A) 0.0359
B) 0.4641
C) 0.2321
D) 0.0718
E) 0.0528

Question

Quizplus · Accepted Answer

To find the p-value, we can use a standard normal table or calculator to find the area to the left of -1.80 and the area to the right of 1.80, and then add those two areas together (since this is a two-tail test). The area to the left of -1.80 is approximately 0.0359, and the area to the right of 1.80 is also approximately 0.0359. Adding these together gives a p-value of 0.0718, which is closest to choice D.

In a Normal Approximation to the Wilcoxon Rank Sum Test